Puncture-proof protection device and pre-filled syringe

Abstract

The invention relates to the field of injection devices, in particular to a puncture-proof protection device and a pre-filled syringe, the puncture-proof protection device comprises a medicine bin shell, a needle hiding sleeve, a needle hiding connecting rod, a connecting rod spring, a medicine bottle support, a medicine bottle gland, a needle hiding limiting piece and a pre-filled medicine bottle; the needle hiding sleeve and the needle hiding connecting rod are connected and arranged in the medicine bin shell, and the needle hiding limiting piece and the medicine bin gland are sequentially arranged at the end, away from the needle hiding sleeve, of the needle hiding connecting rod. A shifting block is arranged on the needle hiding limiting sheet; the shifting block drives the hidden needle limiting piece to rotate to limit or release the axial movement of the hidden needle connecting rod; the needle-hidden connecting rod and the pre-filled medicine bottle are sleeved in the medicine bottle bracket, and a connecting rod spring is arranged between the needle-hidden connecting rod and the medicine bottle bracket; the needle hiding sleeve is fixed by clamping the needle hiding connecting rod and the needle hiding limiting piece, so that the needle head is prevented from being exposed out of the needle hiding sleeve, and the needle head is prevented from being accidentally injured. Reset is achieved through device elasticity, the process is simple and convenient, the automation degree is high, and user operation difficulty is low.

Description

Technical Field

[0001] The present invention relates to the field of injection devices, in particular to a device with anti-puncture protection and a prefilled syringe. Background Art

[0002] Disposable prefilled syringes are a common and widely used product in the self-administration system market. Disposable prefilled syringes eliminate the need to draw medication from a vial into the syringe, shortening administration time and reducing medication waste.

[0003] A disposable prefilled syringe generally includes a main unit and a medicine chamber. The main unit is configured as a reusable part with a motor and battery, and the medicine chamber is configured as a disposable consumable. The medicine chamber contains a disposable prefilled medicine bottle, and the medicine chamber is detachably connected to the main unit to facilitate replacement of the disposable prefilled medicine bottle.

[0004] In order to prevent the used syringe needle from accidentally injuring the user and causing unnecessary harm, or the medicine chamber of the pre-filled medicine bottle from being reused, it is generally required that the needle be uniformly recycled and destroyed after the injection is completed; however, there is still the possibility of accidental injury during the recycling process. Therefore, with the further strict management of medical devices, some institutions have required the installation of special protective devices on disposable pre-filled medicine bottles.

[0005] Therefore, this problem is solved by designing a pre-filled medicine bottle needle protection device used on a medicine chamber used with an electronic injection pen. Summary of the Invention

[0006] In order to overcome the problems existing in the prior art, the present invention aims to provide a device with anti-puncture protection and a pre-filled syringe to prevent accidental injury by the injection needle.

[0007] To achieve the above-mentioned object, the present invention provides the following technical solutions: a device with anti-stab protection, comprising a medicine chamber housing, at least one set of limiting components, a connecting rod spring, a medicine bottle holder, a medicine bottle pressure cap, a hidden needle limiting piece and a pre-filled medicine bottle;

[0008] The limiting assembly includes a hidden needle sleeve and a hidden needle connecting rod, which are connected and arranged in the medicine chamber housing, and a hidden needle limiting piece and a medicine chamber pressure cover are sequentially arranged on the end of the hidden needle connecting rod away from the hidden needle sleeve;

[0009] The hidden needle limiting piece is engaged with the hidden needle connecting rod to limit the axial movement of the hidden needle connecting rod; a toggle block is provided on the hidden needle limiting piece;

[0010] The hidden needle connecting rod and the prefilled medicine bottle sleeve are arranged in the medicine bottle holder, and a connecting rod spring is provided between the hidden needle connecting rod and the medicine bottle holder; the needle end of the prefilled medicine bottle is inserted into the hidden needle sleeve from the medicine bottle holder, and the tail end of the prefilled medicine bottle is connected to the medicine bottle holder.

[0011] A connecting rod spring is provided on the hidden needle connecting rod. When not in use, the connecting rod spring is set to a compressed state, and the needle of the pre-filled medicine bottle is set to be lower than the plane of the hidden needle sleeve to protect the needle from being exposed.

[0012] The medicine chamber is used in conjunction with the electronic injection pen host. In the initial state, the hidden needle sleeve extends out of the medicine chamber shell, and the hidden needle limit plate is engaged with the hidden needle connecting rod, which limits the axial movement of the hidden needle sleeve and protects the needle inside.

[0013] After the drug reservoir is assembled into the electronic injection pen, a lever on the pen's body moves the toggle block on the needle stopper, releasing the needle connecting rod and allowing the needle cover to move freely. This contact with the injection site forces the needle cover into the reservoir housing, exposing the needle tip for injection. After the injection, the drug reservoir is separated from the injection site and the pen is removed. During this process, the needle stopper and the needle connecting rod are reset due to the spring. The needle stopper reengages the needle connecting rod, limiting the axial movement of the needle cover and achieving needle puncture protection.

[0014] The present invention is further configured as follows: the medicine chamber housing comprises a needle extension section, a transition section and a mounting section, and the needle extension section is sequentially connected to the transition section and the mounting section;

[0015] The inner wall of the needle extension section is provided with a first track rib for connecting to the hidden needle sleeve;

[0016] The inner wall of the transition section is provided with protruding limiting ribs for limiting the position of the medicine bottle holder;

[0017] The inner wall of the mounting section is provided with a second track rib for connecting to the medicine bottle holder.

[0018] The present invention is further configured as follows: one end of the hidden needle sleeve is provided with a protruding connecting section along the circumferential direction, the connecting section is provided with a connecting through hole, and a protruding clamping block is provided in the connecting through hole;

[0019] One end of the hidden needle connecting rod is provided with a first clamping groove, which matches the shape of the connecting through hole and is clamped with the clamping block.

[0020] The present invention is further configured as follows: a first track groove is further provided on the connecting section of the hidden needle sleeve, and the position and shape of the first track groove match those of the first track rib.

[0021] The first track groove and the first clamping groove are staggered.

[0022] The purpose of the above structure is to guide and limit the rotational movement of the hidden needle sleeve through the first track rib, so that the hidden needle sleeve can only reciprocate along the axial direction of the medicine chamber shell.

[0023] The present invention is further configured as follows: the medicine bottle holder includes a supporting section and a guiding section; one end of the supporting section close to the guiding section is a first stop surface, and the other end is provided with a mounting groove;

[0024] The interior of the support section includes a medicine bottle compartment and a connecting rod compartment, and the connecting rod compartment is arranged on the outside of the medicine bottle compartment; the medicine bottle compartment extends from the mounting groove to the bottom end of the guide section; and the connecting rod compartment extends from the mounting groove to the first stop surface.

[0025] The present invention is further configured as follows: the outer wall of the support section is further provided with a second track groove, the second track groove being matched with the position and shape of the second track rib;

[0026] The second track rib is inserted into the second track groove, and the first stop surface abuts against the limiting rib.

[0027] The axial movement of the medicine bottle holder is limited by the limiting ribs, and the rotational movement of the medicine bottle holder is limited by the second track ribs.

[0028] The present invention is further configured as follows: a U-shaped connecting rod guide groove is provided on the outer wall of the guide section along the insertion position of the hidden needle connecting rod.

[0029] The present invention is further configured as follows: a second clamping groove is provided at one end of the hidden needle connecting rod away from the first clamping groove, and the hidden needle connecting rod passes through the connecting rod compartment and is connected to the hidden needle limiting plate through the second clamping groove.

[0030] The present invention is further configured as follows: a spring lower limit is also provided on the hidden needle connecting rod, one end of the connecting rod spring is against the spring lower limit, and the other end is against the inner wall of the connecting rod compartment.

[0031] The present invention is further configured as follows: a connecting rod through hole is provided on the medicine bottle pressure cover, the hidden needle limiting plate is connected to the medicine bottle pressure cover, and the hidden needle connecting rod is connected to the hidden needle limiting plate and passes through the connecting rod through hole.

[0032] The present invention is further configured as follows: the outer wall of the medicine bottle pressure cap is provided with a third track groove, the third track groove matches the position and shape of the second track rib, and limit blocks are further provided on both sides of the top of the second track rib;

[0033] The third track groove is connected to the second track rib, and the top of the medicine bottle pressure cap abuts against the limit block.

[0034] The purpose of the above structure is to limit the rotational movement of the medicine bottle cap by the second track rib, limit the upward axial movement of the medicine bottle cap by the limit block, and the downward axial movement of the medicine bottle cap is limited by the medicine bottle bracket to prevent the medicine bottle cap from detaching from the medicine chamber shell.

[0035] The present invention is further configured such that: the hidden needle limiting piece is a toggle piece or a metal spring piece.

[0036] The present invention is further configured as follows: a limited opening and an elastic arm are provided on the toggle piece;

[0037] The toggle block is arranged on the top of the toggle plate, and the elastic arm is arranged axially along the toggle plate; the hidden needle connecting rod passes through the limiting opening and is clamped with one side of the limiting opening through the second clamping groove, and the axial length of the limiting opening is greater than the diameter of the hidden needle connecting rod.

[0038] The present invention is further configured as follows: a blocking rib is provided at the bottom of the medicine bottle pressure cap along the movement direction of the elastic arm, a toggle slide is provided on the medicine bottle pressure cap, a toggle piece is provided at the bottom of the medicine bottle pressure cap, and the toggle block extends out of the toggle slide.

[0039] During use, a lever on the main unit moves the toggle block, rotating the needle stopper, disengaging the stopper opening from the second engaging slot and releasing the needle connecting rod, allowing the needle sleeve to move freely. After injection is complete, the elastic arm returns to its original position due to the force generated by contact with the blocking rib, and the needle connecting rod also returns to its original position due to the elasticity of the connecting rod spring, reengaging the stopper opening with the second engaging slot.

[0040] The present invention is further configured as follows: the metal spring includes a fixed arm, the fixed arm is connected to the toggle block, and the toggle block is an elastic limiting arm;

[0041] The fixed arm is fixed to the top of the medicine bottle pressure cap, and the elastic limiting arm is clamped with the second clamping groove.

[0042] The elastic limiting arm is a limiting structure composed of a bent metal spring, which is limited by engaging with the second engaging slot. After the medicine chamber and the main unit are connected, the elastic limiting arm is pressed to leave the second engaging slot, releasing the hidden needle connecting rod to move.

[0043] The present invention also relates to a prefilled syringe comprising the above-mentioned device with anti-puncture protection.

[0044] In summary, the beneficial effects of the above technical solution of the present invention are as follows:

[0045] 1. The present invention fixes the hidden needle cover by clamping the hidden needle connecting rod and the hidden needle limiting plate, thereby preventing the needle from being exposed outside the hidden needle cover, and effectively preventing accidental injury caused by the needle.

[0046] 2. This invention works with the electronic injection pen's main unit. By rotating the hidden needle stopper, the hidden needle connecting rod is released. This allows the hidden needle connecting rod and the hidden needle cover to move axially during the injection process, exposing the internal needle tip and allowing injection. After the injection is completed, the hidden needle stopper returns to its original position, and the hidden needle connecting rod also returns to its original position due to the action of the connecting rod spring. The hidden needle stopper reengages the hidden needle connecting rod, limiting the axial movement of the hidden needle cover, achieving needle puncture protection and preventing secondary contamination.

[0047] Resetting is achieved through the connecting rod spring and the elastic arm of the hidden needle stopper, which simplifies the process, is highly automated, and reduces user operation difficulty. In addition, the needle tip only appears from the hidden needle cover during injection, which improves safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0049] Figure 1 is an axonometric view of a first embodiment of the present invention;

[0050] Figure 2 An exploded axonometric view of a first embodiment of the present invention;

[0051] Figure 3 is an axial cross-sectional view of a first embodiment of the present invention;

[0052] Figure 4 This is an axial cross-sectional view of the first embodiment of the present invention after the hidden needle connecting rod is released from the restraining position;

[0053] Figure 5 This is an axial view of the connecting rod position when the hidden needle connecting rod is in a limited state according to the first embodiment of the present invention;

[0054] Figure 6 This is an axial view of the connecting rod position when the hidden needle connecting rod is released and limited in the first embodiment of the present invention;

[0055] Figure 7 This is a cross-sectional view of the internal structure of the medicine storage shell according to the first embodiment of the present invention;

[0056] Figure 8 This is an axonometric view of a hidden needle sleeve according to a first embodiment of the present invention;

[0057] Figure 9 This is an axonometric view of the hidden needle connecting rod according to the first embodiment of the present invention;

[0058] Figure 10 This is an axial sectional view of the medicine bottle holder according to the first embodiment of the present invention;

[0059] Figure 11 This is a front axonometric view of the medicine bottle capping according to the first embodiment of the present invention;

[0060] Figure 12 This is an axonometric view of the reverse side of the medicine bottle capping according to the first embodiment;

[0061] Figure 13 This is an axonometric view of the hidden needle limiting piece according to the first embodiment of the present invention;

[0062] Figure 14 Schematic diagram of the state of the second engaging groove and the limiting opening before and when the toggle block of the hidden needle limiting plate is toggled;

[0063] Figure 15 This is a schematic diagram of the state of the second engaging groove and the limiting opening when the toggle block of the hidden needle limiting plate is toggled;

[0064] Figure 16 A cross-sectional view of an embodiment of the present invention connected to an electronic injection pen host;

[0065] Figure 17 for Figure 16 A partial enlarged view of the middle part;

[0066] Figure 18 This is a schematic diagram of the toggle lever provided on the electronic injection pen host;

[0067] Figure 19 is an axonometric view of a second embodiment of the present invention;

[0068] Figure 20 is a cross-sectional view of a second embodiment of the present invention;

[0069] Figure 21 This is a schematic diagram of the implementation of the toggle switch in Example 2 of the present invention;

[0070] Figure 22 for Figure 21 A partial enlarged view of point B in the middle;

[0071] Figure 23 This is an axonometric view of the hidden needle limiting piece of the second embodiment.

[0072] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0073] 1. Medicine chamber shell, 1-1. First track rib, 1-2. Limiting rib, 1-3. Second track rib, 1-4. Limiting block, 1-11. Needle extension section, 1-12. Transition section, 1-13. Installation section;

[0074] 2. Hidden needle sleeve, 2-1. First track groove, 2-2. Connecting through hole;

[0075] 3. Hidden needle connecting rod, 3-1. Spring lower limit, 3-2. First clamping slot, 3-3. Second clamping slot;

[0076] 4. Medicine bottle holder, 4-1. Connecting rod compartment, 4-2. Mounting groove, 4-3. First stop surface, 4-4. Second track groove, 4-5. Connecting rod guide groove;

[0077] 5. Medicine bottle capping, 5-1. Connecting rod through hole, 5-2. Sliding slide, 5-3. Blocking rib, 5-4. Third track groove;

[0078] 6. Hidden needle limiting piece, 6-1. Toggle block, 6-2. Elastic arm, 6-3. Limiting opening;

[0079] 7. Connecting rod spring;

[0080] 8. Pre-filled medicine bottles;

[0081] 9-1, toggle lever;

[0082] 10. Metal shrapnel, 10-1. Elastic limiting arm, 10-2. Fixed arm. DETAILED DESCRIPTION

[0083] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention is clearly and completely described below in conjunction with the drawings of the present invention. Based on the embodiments of the present invention, other similar embodiments obtained by ordinary technicians in this field without making creative work should all fall within the scope of protection of the present invention. In addition, the directional words mentioned in the following embodiments, such as "up", "down", "left", "right", etc., are only reference to the directions of the drawings. Therefore, the directional words used are used to illustrate rather than limit the invention.

[0084] The present invention will be further described below with reference to the accompanying drawings and preferred embodiments.

[0085] Example 1:

[0086] like Figures 1-18 As shown in the figure, a preferred embodiment of the present invention is a device with anti-stab protection, including a medicine chamber shell 1, at least one set of limiting components, a connecting rod spring 7, a medicine bottle bracket 4, a medicine bottle pressure cover 5, a hidden needle limiting piece 6 and a pre-filled medicine bottle 8; in this embodiment, the limiting component is shown in the figure, with two sets of limiting components symmetrically arranged around the axis of the medicine chamber shell 1.

[0087] Combine Figure 1-Figure 2As shown, the limiting assembly includes a hidden needle sleeve 2 and a hidden needle connecting rod 3, which are connected and arranged in the medicine chamber housing 1. The end of the hidden needle connecting rod 3 away from the hidden needle sleeve 2 is sequentially provided with a hidden needle limiting piece 6 and a medicine chamber pressure cover 5; the hidden needle limiting piece 6 is engaged with the hidden needle connecting rod 3 to limit the axial movement of the hidden needle connecting rod 3; the hidden needle limiting piece 6 is provided with a toggle block 6-1;

[0088] The hidden needle connecting rod 3 and the prefilled medicine bottle 8 are arranged in the medicine bottle holder 4, and a connecting rod spring 7 is provided between the hidden needle connecting rod 3 and the medicine bottle holder 4; the needle end of the prefilled medicine bottle 8 is inserted into the hidden needle sleeve 2 from the medicine bottle holder 4, and the tail end of the prefilled medicine bottle 8 is connected to the medicine bottle holder 4.

[0089] like Figure 3 、 Figure 5 As shown, in the initial state, the hidden needle cover 2 extends out of the medicine chamber housing 1, shielding the needle of the internal pre-filled medicine bottle 8. Figure 4 、 Figure 6 As shown, when the hidden needle limiting piece 6 is moved to release the hidden needle connecting rod 3, the hidden needle connecting rod 3 and the hidden needle sleeve 2 move along the axial direction of the device.

[0090] Combine Figure 7 As shown, the medicine storage housing 1 includes a needle extension section 1-11, a transition section 1-12 and a mounting section 1-13, and the needle extension section 1-11 is sequentially connected to the transition section 1-12 and the mounting section 1-13;

[0091] The inner wall of the needle extension section 1-11 is provided with a first track rib 1-1, which is used to connect the hidden needle sleeve 2;

[0092] The inner wall of the transition section 1-12 is provided with a protruding limiting rib 1-2, which is used to limit the medicine bottle holder 4;

[0093] The inner wall of the mounting section 1-13 is provided with a second track rib 1-3 for connecting the medicine bottle holder 4.

[0094] Combine Figure 8 As shown, one end of the hidden needle sleeve 2 is provided with a protruding connecting section along the circumferential direction, the connecting section is provided with a connecting through hole 2-2, and a protruding clamping block is provided in the connecting through hole 2-2;

[0095] Combine Figure 9 As shown, one end of the hidden needle connecting rod 3 is provided with a first clamping groove 3-2, the first clamping groove 3-2 matches the shape of the connecting through hole 2-2 and is clamped with the clamping block.

[0096] The connecting section of the hidden needle sleeve 2 is further provided with a first track groove 2-1, and the position and shape of the first track groove 2-1 match those of the first track rib 1-1.

[0097] Combine Figure 10 As shown, the medicine bottle holder 4 includes a supporting section and a guiding section; one end of the supporting section close to the guiding section is a first stop surface 4-3, and the other end is provided with a mounting groove 4-2;

[0098] The interior of the support section includes a medicine bottle compartment and a connecting rod compartment 4-1, and the connecting rod compartment 4-1 is arranged on the outside of the medicine bottle compartment; the medicine bottle compartment extends from the mounting groove 4-2 to the bottom end of the guide section; the connecting rod compartment 4-1 extends from the mounting groove 4-2 to the first stop surface 4-3.

[0099] The outer wall of the support section is further provided with a second track groove 4-4, and the second track groove 4-4 matches the position and shape of the second track rib 1-3;

[0100] The second track rib 1 - 3 is inserted into the second track groove 4 - 4 , and the first stop surface 4 - 3 abuts against the limiting rib 1 - 2 .

[0101] The axial movement of the medicine bottle holder 4 is limited by the limiting ribs 1-2, and the rotational movement of the medicine bottle holder 4 is limited by the second track ribs 1-3.

[0102] The outer wall of the guide section is further provided with a U-shaped connecting rod guide groove 4-5 along the insertion position of the hidden needle connecting rod 3.

[0103] The end of the hidden needle connecting rod 3 away from the first clamping groove 3-2 is provided with a second clamping groove 3-3. After passing through the connecting rod compartment 4-1, the hidden needle connecting rod 3 is connected to the hidden needle limiting plate 6 through the second clamping groove 3-3.

[0104] The hidden needle connecting rod 3 is also provided with a spring lower limit 3-1, one end of the connecting rod spring 7 is against the spring lower limit 3-1, and the other end is against the inner wall of the connecting rod compartment 4-1.

[0105] Combine Figure 11-12 As shown, a connecting rod through hole 5-1 is provided on the medicine bottle pressure cover 5, the hidden needle limiting plate 6 is connected to the medicine bottle pressure cover 5, and the hidden needle connecting rod 3 is connected to the hidden needle limiting plate 6 and passes through the connecting rod through hole 5-1.

[0106] The outer wall of the medicine bottle pressure cap 5 is provided with a third track groove 5-4, which matches the position and shape of the second track rib 1-3. Limiting blocks 1-4 are also provided on both sides of the top of the second track rib 1-3;

[0107] The third track groove 5-4 is connected to the second track rib 1-3, and the top of the medicine bottle pressing cap 5 abuts against the limiting block 1-4.

[0108] The rotational movement of the medicine bottle cap 5 is limited by the second track rib 1-3, the upward axial movement of the medicine bottle cap 5 is limited by the limit block 1-4, and the downward axial movement of the medicine bottle cap 5 is limited by the medicine bottle bracket 4 to prevent the medicine bottle cap 5 from detaching from the medicine chamber shell 1.

[0109] Combine Figure 13 As shown, in this embodiment, the hidden needle limiting piece 6 adopts a toggle piece, and the toggle piece is provided with a limiting opening 6-3 and an elastic arm 6-2;

[0110] The toggle block 6-1 is arranged on the top of the toggle plate, and the elastic arm 6-2 is arranged axially along the toggle plate; the hidden needle connecting rod 3 passes through the limiting opening 6-3 and is clamped with one side of the limiting opening 6-3 through the second clamping groove 3-3, and the axial length of the limiting opening 6-3 is greater than the diameter of the hidden needle connecting rod 3.

[0111] A blocking rib 5-3 is provided at the bottom of the medicine bottle pressure cap 5 along the movement direction of the elastic arm 6-2, a toggle slot 5-2 is provided on the medicine bottle pressure cap 5, a toggle piece is provided at the bottom of the medicine bottle pressure cap 5, and the toggle block 6-1 extends out of the toggle slot 6-3.

[0112] Combine Figure 18 As shown, a toggle lever 9 - 1 is provided in the host of the electronic injection pen. The host drives the toggle lever 9 - 1 to rotate, toggle the toggle block 6 - 1, and further drives the hidden needle limiting piece 6 to rotate.

[0113] Combine Figure 14-17 As shown, when not in use, the connecting rod spring 7 is compressed, and the needle tip of the prefilled medicine bottle 8 is positioned below the plane of the hidden needle guard 2, protecting the needle tip from exposure. During actual use, a toggle lever 9-1 on the main unit toggles the toggle block 6-1, rotating the hidden needle retaining plate 6. This disengages the retaining opening 6-3 from the second engaging groove 3-3, releasing the hidden needle connecting rod 3 and allowing the hidden needle guard 2 to move freely. As the hidden needle guard 2 contacts the injection site, it is pressed into the medicine chamber housing 1, exposing the needle tip within for injection.

[0114] After the injection is completed, the medicine chamber shell 1 is separated from the injection position and the electronic injection pen main unit is removed. During this process, the elastic arm 6-2 is reset due to the elastic force generated by the contact with the blocking rib 5-3, and the hidden needle connecting rod 3 is also reset due to the elasticity of the connecting rod spring 7. The hidden needle sleeve 2 extends out of the medicine chamber shell 1, and the hidden needle limiting piece 6 is engaged with the hidden needle connecting rod 3 again to limit the axial movement of the hidden needle sleeve 2, thereby realizing the needle puncture prevention function and avoiding secondary contamination.

[0115] Example 2:

[0116] like Figures 19-23FIG. 1 is a preferred embodiment of the present invention, a device with puncture protection, which differs from the first embodiment only in that the hidden needle limiting piece in the present embodiment adopts a metal spring 10, including a fixed arm 10-2, which is connected to the toggle block, and the toggle block is an elastic limiting arm 10-1;

[0117] The fixed arm 10 - 2 is fixed to the top of the medicine bottle pressure cover 5 , and the elastic limiting arm 10 - 1 is engaged with the second engaging groove 3 - 3 .

[0118] The elastic limiting arm 10-1 is a limiting structure composed of a metal spring with a bent structure, which is limited by being engaged with the second engaging groove 3-3. After the medicine chamber and the main machine are connected, the elastic limiting arm 10-1 is moved out of the second engaging groove 3-3 by the toggle rod 9-1, releasing the hidden needle connecting rod 3 to move.

[0119] Example 3:

[0120] like Figure 16 or Figure 21 As shown, the present invention also relates to a prefilled syringe, comprising a puncture-proof protection device as described in Example 1 or Example 2.

[0121] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions of the technical solution of the present invention by ordinary technicians in this field do not deviate from the essence and scope of the technical solution of the present invention.

Claims

1. A device with stab protection, characterized in that: It includes a medicine chamber shell, at least one set of limiting components, a connecting rod spring, a medicine bottle bracket, a medicine bottle pressure cover, a hidden needle limiting piece and a pre-filled medicine bottle; The limiting assembly includes a hidden needle sleeve and a hidden needle connecting rod, which are connected and arranged in the medicine chamber housing, and a hidden needle limiting piece and a medicine chamber pressure cover are sequentially arranged on the end of the hidden needle connecting rod away from the hidden needle sleeve; The hidden needle limiting piece is engaged with the hidden needle connecting rod, and a toggle block is provided on the hidden needle limiting piece; the toggle block drives the hidden needle limiting piece to rotate, thereby limiting or releasing the axial movement of the hidden needle connecting rod; The hidden needle connecting rod and the prefilled medicine bottle sleeve are arranged in the medicine bottle holder, and a connecting rod spring is provided between the hidden needle connecting rod and the medicine bottle holder; the needle end of the prefilled medicine bottle is inserted into the hidden needle sleeve from the medicine bottle holder, and the tail end of the prefilled medicine bottle is connected to the medicine bottle holder.

2. A stab-proof device according to claim 1, characterized in that: The medicine storage housing includes a needle extension section, a transition section and a mounting section, wherein the needle extension section is sequentially connected to the transition section and the mounting section; The inner wall of the needle extension section is provided with a first track rib; the inner wall of the transition section is provided with a protruding limiting rib; and the inner wall of the installation section is provided with a second track rib.

3. A stab-proof device according to claim 2, characterized in that: One end of the hidden needle sleeve is provided with a protruding connecting section along the circumferential direction, the connecting section is provided with a connecting through hole, and a protruding clamping block is provided in the connecting through hole; One end of the hidden needle connecting rod is provided with a first clamping groove, which matches the shape of the connecting through hole and is clamped with the clamping block.

4. A stab-proof device according to claim 3, characterized in that: The connecting section of the hidden needle sleeve is further provided with a first track groove, and the position and shape of the first track groove match those of the first track rib.

5. The device with stab protection according to claim 3, characterized in that: The medicine bottle holder includes a supporting section and a guiding section; one end of the supporting section close to the guiding section is a first stop surface, and the other end of the supporting section is provided with a mounting groove; The interior of the support section includes a medicine bottle compartment and a connecting rod compartment, and the connecting rod compartment is arranged on the outside of the medicine bottle compartment; the medicine bottle compartment extends from the mounting groove to the bottom end of the guide section; and the connecting rod compartment extends from the mounting groove to the first stop surface.

6. A stab-proof device according to claim 5, characterized in that: The outer wall of the support section is further provided with a second track groove, the second track groove being matched with the position and shape of the second track rib; The second track rib is inserted into the second track groove, and the first stop surface abuts against the limiting rib.

7. A stab-proof device according to claim 6, characterized in that: A U-shaped connecting rod guide groove is also provided on the outer wall of the guide section along the insertion position of the hidden needle connecting rod.

8. The device with stab protection according to claim 5, characterized in that: A second clamping groove is provided at one end of the hidden needle connecting rod away from the first clamping groove. After the hidden needle connecting rod passes through the connecting rod compartment, it is connected to the hidden needle limiting piece through the second clamping groove.

9. A stab-proof device according to claim 8, characterized in that: The hidden needle connecting rod is also provided with a spring lower limit, one end of the connecting rod spring is against the spring lower limit, and the other end is against the inner wall of the connecting rod cabin.

10. The device with stab protection according to claim 8, characterized in that: The medicine bottle pressure cover is provided with a connecting rod passing hole, the hidden needle limiting piece is connected to the medicine bottle pressure cover, and the hidden needle connecting rod is connected to the hidden needle limiting piece and passes through the connecting rod passing hole.

11. A stab-proof device according to claim 10, characterized in that: The outer wall of the medicine bottle gland is provided with a third track groove, which matches the position and shape of the second track rib, and limit blocks are also provided on both sides of the top of the second track rib; The third track groove is connected to the second track rib, and the top of the medicine bottle pressure cap abuts against the limit block.

12. The device with stab protection according to claim 10, characterized in that: The hidden needle limiting piece is a toggle piece or a metal spring piece.

13. A stab-proof device according to claim 12, characterized in that: The toggle piece is provided with a limited opening and an elastic arm; The toggle block is arranged on the top of the toggle plate, and the elastic arm is arranged axially along the toggle plate; the hidden needle connecting rod passes through the limiting opening and is clamped with one side of the limiting opening through the second clamping groove, and the axial length of the limiting opening is greater than the diameter of the hidden needle connecting rod.

14. A stab-proof device according to claim 13, characterized in that: The bottom of the medicine bottle pressure cap is provided with a blocking rib along the movement direction of the elastic arm, the medicine bottle pressure cap is provided with a toggle slide groove, the toggle piece is provided at the bottom of the medicine bottle pressure cap, and the toggle block extends out of the toggle slide groove.

15. The device with stab protection according to claim 12, characterized in that: The metal dome includes a fixed arm connected to the toggle block, and the toggle block is an elastic limiting arm; The fixed arm is fixed to the top of the medicine bottle pressure cap, and the elastic limiting arm is clamped with the second clamping groove.

16. A prefilled syringe, characterized in that: A device with stab protection comprising any one of claims 1-15.

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